/Engine/Plugins/Runtime/MassEntity/Source/MassEntity/Public/MassObserverManager.h
void OnPreFragmentOrTagRemoved ( const [UScriptStruct](API\Runtime\CoreUObject\UObject\UScriptStruct) & FragmentOrTagType, const [FMassArchetypeEntityCollection](API\Plugins\MassEntity\FMassArchetypeEntityCollection) & EntityCollection )